The title of Marquess of Ailsa was created in the Peerage of the United Kingdom in 1831 for Archibald Kennedy, 12th Earl of Cassilis .
The Marquess holds the subsidiary titles of Earl of Cassilis (Scottish, 1509), Lord Kennedy (Scottish, 1457), and Baron Ailsa (UK, 1806).
Lords Kennedy (1457)
- Gilbert Kennedy, 1st Lord Kennedy (c. 1406-c. 1480)
- John Kennedy, 2nd Lord Kennedy (d. 1508)
- David Kennedy, 3rd Lord Kennedy (d. 1513) (became Earl of Cassilis in 1509)
Earls of Cassilis (1509)
- David Kennedy, 1st Earl of Cassilis (d. 1513)
- Gilbert Kennedy, 2nd Earl of Cassilis (d. 1527)
- Gilbert Kennedy, 3rd Earl of Cassilis (1515-1558)
- Gilbert Kennedy, 4th Earl of Cassilis (c. 1541-1576)
- John Kennedy, 5th Earl of Cassilis (c. 1573-1615)
- John Kennedy, 6th Earl of Cassilis (d. 1668)
- John Kennedy, 7th Earl of Cassilis (d. 1701)
- John Kennedy, 8th Earl of Cassilis (1700-1759)
- Thomas Kennedy, 9th Earl of Cassilis (d. 1775)
- David Kennedy, 10th Earl of Cassilis (d. 1792)
- Archibald Kennedy, 11th Earl of Cassilis (d. 1794)
- Archibald Kennedy, 12th Earl of Cassilis (1770-1846) (became Marquess of Ailsa in 1831)
Marquesses of Ailsa (1831)
- Archibald Kennedy, 1st Marquess of Ailsa (1770-1846)
- Archibald Kennedy, 2nd Marquess of Ailsa (1816-1870)
- Archibald Kennedy, 3rd Marquess of Ailsa (1847-1938)
- Archibald Kennedy, 4th Marquess of Ailsa (1872-1943)
- Charles Kennedy, 5th Marquess of Ailsa (1875-1956)
- Angus Kennedy, 6th Marquess of Ailsa (1882-1957)
- Archibald David Kennedy, 7th Marquess of Ailsa (1925-1994)
- Archibald Angus Charles Kennedy, 8th Marquess of Ailsa (b. 1956)
